[PATCH 5/6] commands: drvinfo: support filtering by driver

[Ahmad Fatoum <a.fatoum@pengutronix.de>]

drvinfo can be very long especially for the in-tree defconfigs,
add optional filtering support:

  barebox@board:/ drvinfo imx7d
  Driver  Device(s)
  --------------------
  imx7d-src
          30390000.reset-controller@30390000.of
  imx7d_adc
          30610000.adc@30610000.of
          30620000.adc@30620000.of

  Use 'devinfo DEVICE' for more information

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
---
 commands/drvinfo.c | 13 +++++++++++++
 common/complete.c  | 21 +++++++++++++++++++++
 include/complete.h |  1 +
 3 files changed, 35 insertions(+)

diff --git a/commands/drvinfo.c b/commands/drvinfo.c
index 9f8f971ee9dd..27ff55f01d90 100644
--- a/commands/drvinfo.c
+++ b/commands/drvinfo.c
@@ -5,15 +5,23 @@
 #include <common.h>
 #include <command.h>
 #include <driver.h>
+#include <complete.h>
 
 static int do_drvinfo(int argc, char *argv[])
 {
+	char *filter = NULL;
 	struct driver_d *drv;
 	struct device_d *dev;
 
+	if (IS_ENABLED(CONFIG_AUTO_COMPLETE) && argc > 1)
+		filter = strjoin(" ", &argv[1], argc - 1);
+
 	printf("Driver\tDevice(s)\n");
 	printf("--------------------\n");
 	for_each_driver(drv) {
+		if (filter && !str_has_prefix(drv->name, filter))
+			continue;
+
 		printf("%s\n",drv->name);
 		for_each_device(dev) {
 			if (dev->driver == drv)
@@ -24,6 +32,7 @@ static int do_drvinfo(int argc, char *argv[])
 	if (IS_ENABLED(CONFIG_CMD_DEVINFO))
 		printf("\nUse 'devinfo DEVICE' for more information\n");
 
+	free(filter);
 	return 0;
 }
 
@@ -31,5 +40,9 @@ static int do_drvinfo(int argc, char *argv[])
 BAREBOX_CMD_START(drvinfo)
 	.cmd		= do_drvinfo,
 	BAREBOX_CMD_DESC("list compiled-in device drivers")
+#ifdef CONFIG_AUTO_COMPLETE
+	BAREBOX_CMD_OPTS("[DRIVER]")
+#endif
 	BAREBOX_CMD_GROUP(CMD_GRP_INFO)
+	BAREBOX_CMD_COMPLETE(driver_complete)
 BAREBOX_CMD_END
diff --git a/common/complete.c b/common/complete.c
index ab3c98549314..916d13d776ce 100644
--- a/common/complete.c
+++ b/common/complete.c
@@ -174,6 +174,27 @@ static int device_param_complete(struct device_d *dev, struct string_list *sl,
 	return 0;
 }
 
+int driver_complete(struct string_list *sl, char *instr)
+{
+	struct driver_d *drv;
+	int len;
+
+	if (!instr)
+		instr = "";
+
+	len = strlen(instr);
+
+	for_each_driver(drv) {
+		if (strncmp(instr, drv->name, len))
+			continue;
+
+		string_list_add_asprintf(sl, "%s ", drv->name);
+	}
+
+	return COMPLETE_CONTINUE;
+}
+EXPORT_SYMBOL(driver_complete);
+
 int empty_complete(struct string_list *sl, char *instr)
 {
 	return COMPLETE_END;
diff --git a/include/complete.h b/include/complete.h
index b0e675b5599f..2068760ac235 100644
--- a/include/complete.h
+++ b/include/complete.h
@@ -14,6 +14,7 @@ void complete_reset(void);
 
 int command_complete(struct string_list *sl, char *instr);
 int device_complete(struct string_list *sl, char *instr);
+int driver_complete(struct string_list *sl, char *instr);
 int empty_complete(struct string_list *sl, char *instr);
 int eth_complete(struct string_list *sl, char *instr);
 int command_var_complete(struct string_list *sl, char *instr);
-- 
2.30.2